Treatment of fibrous materials to make them resistant to mildew



Patented Jan. 9, 1940 FmnoUs MA 8 MAKE mm RESISTANT 'ro mmnw maximum or Frederick Thomas mum, Biackley, Manchester,

England No Drawing.

Application February 27, 1987,

ifiggal N0. 128,229. In Great Brltain March's,

12 Claims.

This invention relates to the treatment ofpermeable materials or substances with a proofing or mildew fungi preventing or destroying solution or by the introduction of a chemical compound or its salts and is particularly applicable to textile fabrics and yarns or paper though it is not limited to such application.

It isknown to proof, impregnate or treat cotton materials, artificial silks, silks, woolens, textile m materials, leather, paper and other materials,

goods, substances, etc., with an antiseptic to mildew by applying to the materials in or during the process of manufacture or afterwards certain I chemicals. In particular salicyl-anilide or its derivatives such as salicyl-ortho-anisidide,

salicyl-ortho (or para) toluidide and their salts in particular the sodium salts thereof are much used for such purpose. A large number of arylamides of salicylic acid and alkali salts of these arylamides have been examined and found to have the desired protective action in greater or less degree. In general, however, the anilide and o-alkoxyanilides and their alkali salts are found to bemore potent than other derivatives. Salicyl-arylamides substituted in the salicylic nucleus, e. g., 5-chlorosalicyl-anilide, fl-resorcylic 3o anilide, etc. may also be used with eifect.

The materials or goods to be treated may be impregnated, coated or treated with a solution of thesalicyl-anilide by immersion in a bath, by sprayi painting or in certain cases by introduction into the mass, mixing, or solution or by introduction into the sizing, mordanting, dyeing, finishing or other, operative treatment of the yarn, goods or the like.

In the treatment of cotton or other yarns or fabrics, a solution of salicyl-anilide maybe in- 40 troduced into the sizing bath. The solution may be in water when the sodium salt isused or the arylamide may be dissolved in a solution of caustic soda. The antiseptic is more often found applied in the form of a suspension or partial solution in water. The intention of such treatment is to cause all the goods being permeated or treated to take up from 1/1000 to 1/10000 part of the aforesaid antiseptic proofing agent in proportion to the actual material being treated, but the relative proportion of antiseptic agent distributed or introduced may be greater or less.

Textile substances, goods and other permeable materials-or seeds, plants, etc. can be proofed against mildew by applying the said antiseptic agent in the form of a solution or otherwise either in the process of manufacture, or in the flnishing, dyeing", or other treatment of the material, products, goods, or such like.

This invention is particularly related to such known processes and has for its principal object 5 to increase still further the degree of resistance to mildew by means of an additional treatment.

This invention is based upon a discovery that treatment with aluminium hydroxide of permeable materials which have previously been treated with any of the aforesaid mildew-resistance substances, gives an increased resistance to mildew, by virtue of fixation of. the said mildew-resisting compounds. According to the invention, fibrousor other permeable materials are first treated with a mildew resisting preparation consisting of an arylamide of a salicylic acid and are then further treated for the chemical deposition of aluminium hydroxide from'solution;

According to one convenient application of the invention, cotton canvas fabric is first impregnated with a solution of salicyl-anilide prepared as follows-2% lbs. of salicyl-anilide is dissolved in six pints .880 ammonia. When clear 25 solution is obtained 80 gallons boiling .water is added. The solution is then allowed to cool to F. and the fabric is then padded with the solution and subsequently passed over drying cylin-, so ders. The fabric is then padded with a solution in water or aluminium acetate ofa specific gravity of 1.020. The fabric is then again passed over drying cylinders, the heat of which dispels the acetic acid and water and leaves a. deposit 01' aluminium hydroxide in and/or on the fibres of I the previously treated fabric.

In other examples of the invention, the first impregnation of the fabric is effected with a similarly prepared solution substituting for the salicyl-anilide of the solution of the first example any of the following:Salicyl-ortho-anisidide, salicyl-ortho-toluidide, sodium salt of salicylortho-anisidide, sodium salt of salicyl-orthotoluidide.

The concentration of the solutions of the above examples can be varied with probable consequent variation in the resultant resistance to mildew etc., and spirit or other compatible solvents could be used in the preparation of the solutions as will be obvious to any textile chemist which may be used without damage to the fabric. For example, aluminium for'mate solution could be used in place of the acetate.

Prior to this invention, aluminium hydroxide ll has been deposited within the fibres of fabrics for producing a waterproof eflect. In carrying out the present invention, as already described, the fibres of the fabric have been impregnated with a mildew-resisting compound before the aluminium hydroxide treatment is applied so that the aluminium hydroxide does not penetrate into the fibres as with the known waterproofing processes but is deposited substantially on the fibre and within the fibre only to a slight extent. Thus, according to the present invention, the aluminium hydroxide does not give any appreciable waterproofing efiect, and the object of the treatment, as previously explained, is to fix the mildew-resisting compound previously deposited within the fibre and thereby increase the resistance to mildew.

The known method of treating fabrics with aluminium hydroxide for waterproofing does not appreciably increase the resistance of the treated material to mildew. It will, thus be appreciated that the aluminium hydroxide process mentioned herein does not in itself givean increased resistance to mildew; the effect of the aluminium hydroxide process described herein is due to fixation of the mildew-resisting compound or compounds with which the fabric fibres or the like have previously been impregnated.

As regards the improvement in effect brought about by the present invention, it has been found that whereas the untreated fabric will develop mildew within seven days in an infected incubating chamber, the fabric treated with an arylamide of a salicylic acid does not develop mildew under the same conditions until the expiration of 30 days, whereas fabric treated with an arylamide of a salicylic acid and subsequently treated with aluminium hydi'oxide, in accordance with the preseht invention, does not develop mildew until after 60 days.

What I claim is:--

1. The process of treating fibrous materials to render them resistant to mildew, wherein the fibrous materials are first treated with a mildewresisting preparation consisting of an arylamide of a'salicylic acid and are then further treated for the chemical deposition of a small quantity of aluminium hydroxide by impregnation with a solution of an aluminium salt capable of decomposition by heat to produce aluminium hydroxide and by the application of heat to effect evaporation of the solvent and decomposition of the salt.

2. The process of treating fibrous fabric to render it resistant to mildew, wherein the fibrous fabric is first treated with a mildew-resisting preparation consisting of an arylamide of a salicylic acid and is then further treated by impregnation for the deposition of a small quantity of aluminium hydroxide comprising padding the fabric with a solution of aluminium acetate of a specific gravity of 1.020, and passing the fabric over heated drying cylinders to dispel the acetic acid and leave a deposit of aluminium hydroxide in or on the fibres of the fabric.

3. The process of treating fibrous materials to render them resistant to mildew, wherein the fibrous materials are first treated with a mildewresisting preparation consisting-of an arylamide of a salicylic acid and are then further, treated for the chemical deposition of a small quantity of aluminium hydroxide by impregnation with a solution of aluminium formate and by the application of heat to effect evaporation of the solvent and decomposition of the aluminium formate to leave aluminium hydroxide.

4. The process of treating fibrous materials to fibrous fabric is first treated with an arlamide of a salicylic acid and in the form of its alkali salt and is then further treated for the chemical deposition of a small quantity of aluminium hydroxide by impregnation with a solution of an aluminium salt capable of decomposition by heat to produce aluminium hydroxide and by the application of heat to effect evaporation of the solvent and decomposition of the salt.

5. The process of treating fibrous fabric to render it resistantto mildew, wherein the fibrous fabric is first treated with a mildew-resisting preparation consisting of an arylamide of a salicylic acid in the form of an alkali salt and is then further treated by impregnation for the deposition of a small quantity of aluminium hydroxide comprising padding the fabric with a solution of aluminium acetate of a specific gravity of 1.020, and passing the fabric over heated drying cylinders to dispel the acetic acid and leave a deposit of aluminium hydroxide in or on the fibres of the fabric.

6. The process of treating fibrous materials to render them resistant to mildew wherein the fibrous materials are first treated with a mildewresisting preparation consisting of salicyl-anilide and are then further treated for the chemical deposition of a small quantity of aluminium hydroxide by impregnation with a solution of an aluminium salt capable of decomposition by heat to produce aluminium hydroxide and by the application of heat to effect evaporation of the solvent and decomposition of the salt.

7,. The process of treating fibrous fabric to ren der it resistant to mildew, wherein the fibrous fabric is first treated with a mildew-resisting preparation consisting of salicyl-anilide and is then further treated by impregnation for the deposition of a small quantity of aluminium hydroxide comprising padding the fabric with a solution of aluminium acetate of a specific gravity of 1.020, and passing the fabric over heated render them resistant to mildew, wherein the drying cylinders to dispel the acetic acid and 5 leave a deposit of aluminium hydroxide in or on the fibres of the fabric.

8. The, process of treating fibrous materials to render them resistant to mildew, wherein the fibrous materials are first treated with a mildewresisting preparation consisting of an arylamide of a salicylic acid selected from the group, salicylanilide, salicyl-ortho-anisidide, salicyl-orthotolvidide, salicyl-para-toluidide, 5-chlorosalicylanilide, p-resorcylic anilide, and the alkali salts thereof, and are then further treated for the chemical deposition of a small quantity of aluminium hydroxide by impregnation with a solution of aluminium formate and by the application of heat to effect evaporation of the solvent and decomposition of the aluminium formate to leave aluminium hydroxide. v

9. The process of treating fibrous materials to render them resistant to mildew, wherein the fibrous materials are first treated with a sodium salt of salicyl-anilide and are then further treated for the chemical deposition of a small quantity of aluminium hydroxide by impregnation with a solution of an aluminium salt capable of 70 decomposition. by heat to produce aluminium hydroxide and by the application of heat to effect evaporation oi the solvent and decomposition of the salt.

10. The'process of treating fibrous fabric to II' arcane 1 acid and leave a deposit of aluminium hydroxide in or .on the fibres of the'fabric.

11. The process or treating fibrous materials to render them resistant to mildew. wherein the fibrous materials are first treated with a mildewresisting preparation consisting of an arylamide of a salicylic acid selected from the group, salicyl-ortho-anisidide, salicyl-ortho-toluidide, salicyl-para-toluidide, 5-chlorosa1icyl-anilide, presorcylic anilide, and the alkali'salts thereof, and

. are then further treated for the chemical deposition of a small quantity of aluminium hydroxide by impregnation with a solution of an aluminium salt capable of decomposition by heat to produce aluminium hydroxide and by the application of heat to eiIect evaporation of the solvent and decomposition of the salt.

12. The process of treating fibrous fabric to render it resistant to mildew, wherein the fibrous fabric is first treated with a mildew-resisting preparation consisting of an arylamide of a salicylic acidselected from the group, salicyl-f ortho-anisidide; salicyl-ortho-toluidide, salicylpar'a-toluidide, 5-ch1orosalicyl-anilide, p-resorcylic anilide, and the alkali salts thereof, and is then further treated by impregnation for the deposition of a small quantity of aluminium hydroxide comprising Padding the fabric with a solution of aluminium acetate 01' a specific gravity v of 1.020, .and passing the fabric over heated drying cylinders to dispel the acetic acid andleave a deposit of aluminium hydroxide in or --on the fibres of the fabric.

FREDERICK THOMAS IIETCALF- 

